Rolling mill guide



May 12, 1931. P. G. PALMGREN ROLLING MILL GUIDE Filed Oct. 17, 1929 5 Sheets-Sheet l INV ENTOR PER Gu/v/vAR PALMGRE/V $31 ATTORNEY v I May 12, 1931. P. e. PALMGREN 1,804,947

ROLLING MILL GUIDE Filed 0012.17, 1929 3 Sheets-Sheet 2 INVENTOR PER Gu/v/vAR PALMGREN ATTORNEY May '12, .1931. P. G. PALMGREN 47.

ROLLING MILL GUIDE Filed Oct. 17. 1929 5 Sheets-Sheet 3 INVENTOR PER Gu v/v/w PA L MGRE/V I% K M ATTORNEY B The present invention is Patented May 12, 1931 rna GUNNAR PALMGBEN, or eo'rrnnnozao, SWEDEN ROLLING MILL GUIDE Application filed. October 17, 1929, Serial No. 400,208, and in Sweden October 23, 1928.

In many cases it is usual to provide a (guide before the rolls in rolling mills in 6r er ,to guide the material to the pass and to prevent it from twisting in the pass.

for the purpose of avoiding the disadvantages experienced with guides nowin use and consists mainly of an arrangement by which the guide is kept open toallow the material to enter and is automatically closed after the material has been gripped by the rolls. By this means the entrance of greatly facilitated,while a satisfactory guidance is obtained. This guide may be operatmake the closing mechanism function may be I obtained in several ways as explained in the following: I Y

The invention makes it possible to use repeaters on both sides of the mill even when an oval section is to enter a square pass and still obtain the same high quality of work as by hand, while reducing the number of helpers required. Since the material can be looped over automatically, the speed of the rolls can be considerably increased with a corresponding increase in the capacity of the mill. In continuous mills it is possible to obtain the same accurate dimensions as in looping mills if stretching is avoided between the stands.

This present application is closely related 0 to another application which I am filing concurrently herewith, this present applicationrelating particularly to a design whereby the variation in load on the electric motor driv ing the rolling mill is utilized for controlling a magnet for actuating the guides.

The accompanying drawings show a preferred form of an embodiment of the invention, in which drawings Figure 1 shows an axial section through a guide, the rolls being shown in cross-section.

2 shows a front elevation of the same gm e. v 4 V Fig. 3 is a diagrammatic top view of Figure 1 showing the electrical arrangement and wiring by which the magnet is caused to function by the increase in current, which occurs whenthe rolling begins, and

the material into the guide is ed electrically. The impulse required to Fig. 4 shows diagrammatically an arrangement in which the magnet is connected in a special D. C. circuit.

A pair of work rolls 15 and 16 are illustrated between which is to be passed the bar 14 for the purpose of reducing it. The purose of the invention is to guide the oncoming portion of the bar as it is passing between the rolls. 7

The guide is represented as comprising two halves denoted by the numerals 1 and 2 which are carried by bell crank levers 32--33 r0- tatable about a fixed pivot 34. The bell crank levers are connected to links 37 and 38 by means of joints 35and 36. The links .37 and 38 are connected to a bar 41 through a joint 39. This bar is attached to'the core 11 of a magnet which is mounted on the frame of the machine, the magnet being energized in a manner presently to be described for closing the jaws after the bar has commenced to run through the rolls.

The magnet in this embodiment of m invention is operated by making use 0 the increase in the current, which occurs in the motor circuit of the motor driven rolling.

mills when the material enters the pass.

Some embodiments makin use of this principle are diagrammaticafiy illustrated in Figs. 3 and 4. Y I so Referring to Fig. 3, 44 denotes the-rolling mill driven by the electric motor 45. In front of the rolling mill is placed the guide with its magnet coil 13, connected in the shunt'circuit 47. When the mill is running idle the current is not suflicient to enable the magnet to lift the core and close the guide. As soon as rolling is begun, the load onthe motor is increased and the current rises. The magnet then lifts the core 11 and closes the guide. v A suitable resistance 49 is connected in the motor circuit 48. The resistance is dimensioned in a manner to ensure a sufiiciently strong current in the magnetic circuit.

The magnet can also be arranged as shown 1 in Fig. 4. Thisembodiment differs from that of Fig. 3 mainly in that the magnet coil 13 is connected in a special D. C. circuit 50, which is closed by means of a relay 51 connected in the motor circuit 48, when the motor 0 is loaded. In this case it is possible to make use of a magnet for direct current even if an A. C. motor is used. The resistance 49 in the motor circuit can be smaller than that 6 in While but one form of my invention is described herein, yet it will be apparent that changes may be made Within the scope of the claims Without departing from the spirit of 1 the invention.

Having described my invention I claim and desire to secure by Letters Patent:

1. The combination with rolls of a rolling mill and an electric motor for driving the rolls, of a guide for the material adapted to open and close, an electro-magnet for actuatiug the guides, the circuits of the motor and magnet being so connect-ed that the operating load when rolling the metal acts on the circuit of the motor energizes the magnet and closes the guides.

The combination with rolls of a rolling mill and an electric motor for driving the rolls, of a guide for the material adapted to open and close, an electro-magnet for actuating the guides, the circuits of the motor and magnet being so connected that the operating load when rolling the metal acts on the circuit of the motor energizes the magnet and closes the guides, and that the idle load of the circuit of the motor will cause the guides to open.

3. The combination With a mill provided with rolls and an electric motor for operat- 86 ing the rolls, of guides for the material adapted to open and close, an electro-magnetic device associated With the guides and adapted to close and open the guides, the wiring for the electro-magnetic device being a shunt circuit from a resistance in the motor circuit.

4. The combination with a mill provided with rolls and an electric motor for driving the rolls, of a guide for the material adapted to open and close, an electro-magnet for actuating the guide, there being a resistance in the circuit of the motor, the circuit of the magnet being a shunt from such resistance.

5. The combination With rolls of a rolling mill and housings for one of the rolls, of a guide for the material adapted to open and close, an electro-magnet for actuating the guides, and means associated with the housings and so connected to the guide that the operating load, when the metal is being rolled, acts on the rolls, closes the guides and that idle load on the rolls causes the guide to open. In testimony whereof I have signed my name. PER GUN NAR PALMGREN. 

